若某一随机变量X的分布为
,且
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de8bc2c3fb04ecc54242577517df659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306eeaa12d443ab4b67304681bc33f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
21-22高二·全国·课后作业 查看更多[3]
沪教版(2020) 选修第二册 单元训练 第7章 概率初步(续)—随机变量的分布与特征(B卷)(已下线)专题4期望与方差运算(基础版)(已下线)7.3.1离散型随机变量的均值(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第三册)
更新时间:2022-09-07 11:46:21
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【推荐1】离散型随机变量
的分布列,且
,则
____ ;
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72d6c899d9ece423f5db1f2f529d16b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d81f2bd97c070df88267759a704832.png)
1 | 2 | 3 | |
p |
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【推荐2】已知随机变量
的分布列为
,那么实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1b0547054a4b32b113151b849bedbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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【推荐1】设随机变量
的概率分布如下表所示,且
.
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1817297374e431a1d9087dcc2991d3a9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db5633840e4be3fc6785f17d3986467.png)
1 | 2 | 3 | 4 | |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1817297374e431a1d9087dcc2991d3a9.png)
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【推荐2】离散型随机变量
的分布列为:
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671398cefc5ec05521efd88b1afc89f5.png)
________ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d81f2bd97c070df88267759a704832.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
1 | 2 | 3 | |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72d6c899d9ece423f5db1f2f529d16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671398cefc5ec05521efd88b1afc89f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d81f2bd97c070df88267759a704832.png)
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